The QPinchGesture class describes a pinch gesture made by the user. More...

#include <qgesture.h>

Inheritance diagram for QPinchGesture:

Public Types
enum	ChangeFlag { ScaleFactorChanged = 0x1, RotationAngleChanged = 0x2, CenterPointChanged = 0x4 }
	This enum describes the changes that can occur to the properties of the gesture object. More...

Public Types inherited from QGesture
enum	GestureCancelPolicy { CancelNone = 0, CancelAllInContext }
	This enum describes how accepting a gesture can cancel other gestures automatically. More...

Public Functions
QPointF	centerPoint () const

ChangeFlags	changeFlags () const

QPointF	lastCenterPoint () const

qreal	lastRotationAngle () const

qreal	lastScaleFactor () const

	QPinchGesture (QObject *parent=0)

qreal	rotationAngle () const

qreal	scaleFactor () const

void	setCenterPoint (const QPointF &value)

void	setChangeFlags (ChangeFlags value)

void	setLastCenterPoint (const QPointF &value)

void	setLastRotationAngle (qreal value)

void	setLastScaleFactor (qreal value)

void	setRotationAngle (qreal value)

void	setScaleFactor (qreal value)

void	setStartCenterPoint (const QPointF &value)

void	setTotalChangeFlags (ChangeFlags value)

void	setTotalRotationAngle (qreal value)

void	setTotalScaleFactor (qreal value)

QPointF	startCenterPoint () const

ChangeFlags	totalChangeFlags () const

qreal	totalRotationAngle () const

qreal	totalScaleFactor () const

Public Functions inherited from QGesture
GestureCancelPolicy	gestureCancelPolicy () const

Qt::GestureType	gestureType () const

bool	hasHotSpot () const

QPointF	hotSpot () const

	QGesture (QObject *parent=0)
	Constructs a new gesture object with the given parent. More...

void	setGestureCancelPolicy (GestureCancelPolicy policy)

void	setHotSpot (const QPointF &value)

Qt::GestureState	state () const

void	unsetHotSpot ()

	~QGesture ()
	Destroys the gesture object. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Public Variables
QPointF	centerPoint
	the current center point More...

ChangeFlags	changeFlags
	the property of the gesture that has changed in the current step More...

QPointF	lastCenterPoint
	the last position of the center point recorded for this gesture More...

qreal	lastRotationAngle
	the last reported angle covered by the gesture motion More...

qreal	lastScaleFactor
	the last scale factor recorded for this gesture More...

qreal	rotationAngle
	the angle covered by the gesture motion More...

qreal	scaleFactor
	the current scale factor More...

QPointF	startCenterPoint
	the starting position of the center point More...

ChangeFlags	totalChangeFlags
	the property of the gesture that has change More...

qreal	totalRotationAngle
	the total angle covered by the gesture More...

qreal	totalScaleFactor
	the total scale factor More...

Friends
class	QPinchGestureRecognizer

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Functions inherited from QGesture
	QGesture (QGesturePrivate &dd, QObject *parent)

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

The QPinchGesture class describes a pinch gesture made by the user.

Since: 4.6

A pinch gesture is a form of touch user input in which the user typically touches two points on the input device with a thumb and finger, before moving them closer together or further apart to change the scale factor, zoom, or level of detail of the user interface.

For an overview of gesture handling in Qt and information on using gestures in your applications, see the Gestures Programming document.

Instead of repeatedly applying the same pinching gesture, the user may continue to touch the input device in one place, and apply a second touch to a new point, continuing the gesture. When this occurs, gesture events will continue to be delivered to the target object, containing an instance of QPinchGesture in the Qt::GestureUpdated state.

See also: QPanGesture, QSwipeGesture

Definition at line 136 of file qgesture.h.

Enumerations

◆ ChangeFlag

enum QPinchGesture::ChangeFlag

This enum describes the changes that can occur to the properties of the gesture object.

ScaleFactorChanged The scale factor held by scaleFactor changed.
RotationAngleChanged The rotation angle held by rotationAngle changed.
CenterPointChanged The center point held by centerPoint changed.

See also: changeFlags, totalChangeFlags

Enumerator
ScaleFactorChanged
RotationAngleChanged
CenterPointChanged

Definition at line 143 of file qgesture.h.

                     {
         ScaleFactorChanged = 0x1,
         RotationAngleChanged = 0x2,
         CenterPointChanged = 0x4
     };

Constructors and Destructors

◆ QPinchGesture()

QPinchGesture::QPinchGesture ( QObject * parent = 0 )

Warning: This function is not part of the public interface.

Definition at line 560 of file qgesture.cpp.

     : QGesture(*new QPinchGesturePrivate, parent)
 {
     d_func()->gestureType = Qt::PinchGesture;
 }

Functions

◆ centerPoint()

QPointF QPinchGesture::centerPoint ( ) const

Referenced by setChangeFlags().

◆ changeFlags()

ChangeFlags QPinchGesture::changeFlags ( ) const

Referenced by setTotalChangeFlags().

◆ lastCenterPoint()

QPointF QPinchGesture::lastCenterPoint ( ) const

Referenced by setChangeFlags().

◆ lastRotationAngle()

qreal QPinchGesture::lastRotationAngle ( ) const

Referenced by setScaleFactor().

◆ lastScaleFactor()

qreal QPinchGesture::lastScaleFactor ( ) const

Referenced by setCenterPoint().

◆ rotationAngle()

qreal QPinchGesture::rotationAngle ( ) const

Referenced by setScaleFactor().

◆ scaleFactor()

qreal QPinchGesture::scaleFactor ( ) const

Referenced by setCenterPoint().

◆ setCenterPoint()

void QPinchGesture::setCenterPoint ( const QPointF & value )

Definition at line 611 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->centerPoint = value;
 }

◆ setChangeFlags()

void QPinchGesture::setChangeFlags ( ChangeFlags value )

Definition at line 581 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->changeFlags = value;
 }

◆ setLastCenterPoint()

void QPinchGesture::setLastCenterPoint ( const QPointF & value )

Definition at line 606 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::reset().

 {
     d_func()->lastCenterPoint = value;
 }

◆ setLastRotationAngle()

void QPinchGesture::setLastRotationAngle ( qreal value )

Definition at line 668 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->lastRotationAngle = value;
 }

◆ setLastScaleFactor()

void QPinchGesture::setLastScaleFactor ( qreal value )

Definition at line 637 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->lastScaleFactor = value;
 }

◆ setRotationAngle()

void QPinchGesture::setRotationAngle ( qreal value )

Definition at line 673 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->rotationAngle = value;
 }

◆ setScaleFactor()

void QPinchGesture::setScaleFactor ( qreal value )

Definition at line 642 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->scaleFactor = value;
 }

◆ setStartCenterPoint()

void QPinchGesture::setStartCenterPoint ( const QPointF & value )

Definition at line 601 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->startCenterPoint = value;
 }

◆ setTotalChangeFlags()

void QPinchGesture::setTotalChangeFlags ( ChangeFlags value )

Definition at line 571 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::recognize(), and QMacPinchGestureRecognizer::reset().

 {
     d_func()->totalChangeFlags = value;
 }

◆ setTotalRotationAngle()

void QPinchGesture::setTotalRotationAngle ( qreal value )

Definition at line 663 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::reset().

 {
     d_func()->totalRotationAngle = value;
 }

◆ setTotalScaleFactor()

void QPinchGesture::setTotalScaleFactor ( qreal value )

Definition at line 632 of file qgesture.cpp.

Referenced by QMacPinchGestureRecognizer::reset().

 {
     d_func()->totalScaleFactor = value;
 }

◆ startCenterPoint()

QPointF QPinchGesture::startCenterPoint ( ) const

Referenced by setChangeFlags().

◆ totalChangeFlags()

ChangeFlags QPinchGesture::totalChangeFlags ( ) const

Referenced by QPinchGesture().

◆ totalRotationAngle()

qreal QPinchGesture::totalRotationAngle ( ) const

Referenced by setScaleFactor().

◆ totalScaleFactor()

qreal QPinchGesture::totalScaleFactor ( ) const

Referenced by setCenterPoint().

Friends and Related Functions

◆ QPinchGestureRecognizer

friend class QPinchGestureRecognizer

friend

Definition at line 195 of file qgesture.h.

Properties

◆ centerPoint

QPointF QPinchGesture::centerPoint

the current center point

The center point is the midpoint between the two input points in the gesture.

See also: startCenterPoint, lastCenterPoint

Definition at line 163 of file qgesture.h.

◆ changeFlags

QPinchGesture::ChangeFlags QPinchGesture::changeFlags

the property of the gesture that has changed in the current step

This property indicates which of the other properties has changed since the previous gesture event included information about this gesture. You can use this information to determine which aspect of your user interface needs to be updated.

See also: totalChangeFlags, scaleFactor, rotationAngle, centerPoint

Definition at line 151 of file qgesture.h.

Referenced by QMacPinchGestureRecognizer::recognize().

◆ lastCenterPoint

QPointF QPinchGesture::lastCenterPoint

the last position of the center point recorded for this gesture

See also: centerPoint, startCenterPoint

Definition at line 162 of file qgesture.h.

◆ lastRotationAngle

qreal QPinchGesture::lastRotationAngle

the last reported angle covered by the gesture motion

The last rotation angle is the angle as reported in the rotationAngle property when a previous gesture event was delivered for this gesture.

See also: rotationAngle, totalRotationAngle

Definition at line 158 of file qgesture.h.

◆ lastScaleFactor

qreal QPinchGesture::lastScaleFactor

the last scale factor recorded for this gesture

The last scale factor contains the scale factor reported in the scaleFactor property when a previous gesture event included information about this gesture.

If no previous event was delivered with information about this gesture (i.e., this gesture object contains information about the first movement in the gesture) then this property contains zero.

See also: scaleFactor, totalScaleFactor

Definition at line 154 of file qgesture.h.

◆ rotationAngle

qreal QPinchGesture::rotationAngle

the angle covered by the gesture motion

See also: totalRotationAngle, lastRotationAngle

Definition at line 159 of file qgesture.h.

Referenced by QMacPinchGestureRecognizer::recognize().

◆ scaleFactor

qreal QPinchGesture::scaleFactor

the current scale factor

The scale factor measures the scale factor associated with the distance between two of the user's inputs on a touch device.

See also: totalScaleFactor, lastScaleFactor

Definition at line 155 of file qgesture.h.

Referenced by QMacPinchGestureRecognizer::recognize().

◆ startCenterPoint

QPointF QPinchGesture::startCenterPoint

the starting position of the center point

See also: centerPoint, lastCenterPoint

Definition at line 161 of file qgesture.h.

Referenced by QMacPinchGestureRecognizer::recognize().

◆ totalChangeFlags

QPinchGesture::ChangeFlags QPinchGesture::totalChangeFlags

the property of the gesture that has change

This property indicates which of the other properties has changed since the gesture has started. You can use this information to determine which aspect of your user interface needs to be updated.

See also: changeFlags, scaleFactor, rotationAngle, centerPoint

Definition at line 150 of file qgesture.h.

Referenced by QMacPinchGestureRecognizer::recognize().

◆ totalRotationAngle

qreal QPinchGesture::totalRotationAngle

the total angle covered by the gesture

This total angle measures the complete angle covered by the gesture. Usually, this is equal to the value held by the rotationAngle property, except in the case where the user performs multiple rotations by removing and repositioning one of the touch points, as described above. In this case, the total angle will be the sum of the rotation angles for the multiple stages of the gesture.

See also: rotationAngle, lastRotationAngle

Definition at line 157 of file qgesture.h.

◆ totalScaleFactor

qreal QPinchGesture::totalScaleFactor

the total scale factor

The total scale factor measures the total change in scale factor from the original value to the current scale factor.

See also: scaleFactor, lastScaleFactor

Definition at line 153 of file qgesture.h.

The documentation for this class was generated from the following files:

/src/gui/kernel/qgesture.h
/src/gui/kernel/qgesture.cpp

Public Types

Public Functions

Public Variables

Friends

Additional Inherited Members

Detailed Description

Enumerations

◆ ChangeFlag

Constructors and Destructors

◆ QPinchGesture()

Functions

◆ centerPoint()

◆ changeFlags()

◆ lastCenterPoint()

◆ lastRotationAngle()

◆ lastScaleFactor()

◆ rotationAngle()

◆ scaleFactor()

◆ setCenterPoint()

◆ setChangeFlags()

◆ setLastCenterPoint()

◆ setLastRotationAngle()

◆ setLastScaleFactor()

◆ setRotationAngle()

◆ setScaleFactor()

◆ setStartCenterPoint()

◆ setTotalChangeFlags()

◆ setTotalRotationAngle()

◆ setTotalScaleFactor()

◆ startCenterPoint()

◆ totalChangeFlags()

◆ totalRotationAngle()

◆ totalScaleFactor()

Friends and Related Functions

◆ QPinchGestureRecognizer

Properties

◆ centerPoint

◆ changeFlags

◆ lastCenterPoint

◆ lastRotationAngle

◆ lastScaleFactor

◆ rotationAngle

◆ scaleFactor

◆ startCenterPoint

◆ totalChangeFlags

◆ totalRotationAngle

◆ totalScaleFactor